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Female crab Xantho poressa at spawning time in the Black Sea, carrying eggs under her abdomen A Grapsus tenuicrustatus climbing up a rock in Hawaii. Each species has a particular number of zoeal stages, separated by moults, before they change into a megalopa stage, which resembles an adult crab, except for having the abdomen (tail) sticking out ...
Ovalipes ocellatus, known as the lady crab, is a species of crab from eastern North America. [1] Other names for it include the leopard crab or Atlantic leopard crab due to the leopard-like rosette patterns on its shell, the calico crab (not to be confused with Hepatus epheliticus ), or ocellated crab . [ 3 ]
Blue crab escaping from the net along the Core Banks of North Carolina.. Callinectes sapidus (from the Ancient Greek κάλλος,"beautiful" + nectes, "swimmer", and Latin sapidus, "savory"), the blue crab, Atlantic blue crab, or, regionally, the Maryland blue crab, is a species of crab native to the waters of the western Atlantic Ocean and the Gulf of Mexico, and introduced internationally.
The fiddler crab or calling crab can be one of the hundred species of semiterrestrial marine crabs in the family Ocypodidae. [2] These crabs are well known for their extreme sexual dimorphism, where the male crabs have a major claw significantly larger than their minor claw, whilst females claws are both the same size. [ 3 ]
Seasonal variation of water temperature and sunlight duration are considered as the most important variables determining the breeding period of arrow crabs. [16] There is a positive relationship between fecundity and the size of the parental female. [7] In fact, the size of the female is the key variable in determining the number of eggs per batch.
Males are typically smaller than females, and in some species, such as Emerita rathbunae, the minute males live attached to the legs of the female. [7] Females are around 8–37 mm (0.31–1.46 in) in carapace length, depending on the species, while males vary from a similar size to females in E. austroafricana , down to 2.5 mm (0.098 in ...
Ovalipes catharus, commonly known as the paddle crab, [a] swimming crab, [b] or, in Māori, pāpaka, [8] is a species of crab in the family Ovalipidae. [ 4 ] [ 9 ] It is found in shallow, sandy-bottomed waters around the coasts of New Zealand , the Chatham Islands , and uncommonly in southern Australia .
Chionoecetes opilio, a species of snow crab, also known as opilio crab or opies, is a predominantly epifaunal crustacean native to shelf depths in the northwest Atlantic Ocean and north Pacific Ocean. It is a well-known commercial species of Chionoecetes, often caught with traps or by trawling.